Flask



FIG. 1 is a perspective view of the flask showing the new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a side elevational view thereof; and,

FIG. 5 is an exploded perspective view showing the internal componentsof the flask.

The ornamental design for a flask, as shown and described.